I realy love the fact that you don't blow up with the first scratch and don't need to start over and over again! Great game 5/5 , I believe the game doesn't need upgrades cause it would become a play to buy and win game, which games, sack in my opinion :)
Why would I like to leave this place when I have a storage of 580 capacity , and 30 energy production and my guns pointed at the creeper spawn?! without having them threting me at all :S